The Prefect may issue the operator of the establishment with the necessary formal notices and set a deadline for putting an end to :
1° Failure to comply with health and safety guarantees ;
2° Failure to take out the insurance contract mentioned in article L. 321-1;
3° Particular risks posed by the activity of the establishment to the health and physical or moral safety of the participants;
4° Situations exposing participants to the use of substances or processes prohibited under Book II.
At the end of the set period, the Prefect may oppose the opening or order the temporary or permanent closure of the establishment, by means of a reasoned order, if the operator has not remedied the situations that were the subject of the formal notices.
In urgent cases, the refusal to open or the temporary closure may be ordered without prior formal notice.